schur



Sept. 24, 1929. M. o. scHuR DOSER 1925 4 Sheets-Sheet Filed July 17 & \Nw M. O. SCHUR Sept. 24, 1929.

DOSER Filed July 17, 1925 4 Sheets-Sheet M. O. SCHUR Sept. 24', 192 9.

DOSER Filed July 17, 1925 4 Sheets-Sheet M. O. SCHUR Sept. 24, 1929.

DOSER Filed July 17, 1925 4 sheets sheet iii Patented Sept. 24, 1929UNITED STATES PATENT OFFICE MILTON O. SCHUR, OI BERLIN, NEW HAMPSHIRE,ASSIGNOR TO BROWN COMPANY, OF BERLIN, NEW HAMPSHIRE, A CORPORATION OFMAINE DOSEB Application filed July 17,

This invention relates to mechanism for measuring and dischargingliquids and has been more particularly designed for handling relativelysmall quantities of corrosive liquids or those containing sediment orscale, such liquids, for example, as caustic soda sirup and bleachliquors, as used in paper mills, where other methods employed formeasuring liquids can not be successfully used. In mechanism of thecloser type the liquid is scooped up in dippers from a container for theliquid and then discharged from the dippers, the amount of liquiddispensed depend ing on the capacity of each dipper and the number oftimes it is discharged in a given time interval.

One of the drawbacks of dosers as here tofore constructed is the factthat changes in the level of liquid in the supply container causechanges in the amount picked up at each raising of a dipper, so thatunless this liquid level be maintained substantially constant the rateof discharge may vary considerably from that normally corresponding to agiven dipper capacity and rate of emptying.

One of the objects of the present invention is to provide a constructionwherein the level of liquid in the supply container may vary quiteconsiderably without having any effect on the rate of discharge.

A further feature of the invention relates to the manner of assemblingunits in a sin gle mechanism and controlling them in such a manner thata wide variation by definite small increments in the rate of dischargemay be produced without varying the speed at which the mechanism isdriven.

A further feature of the invention relates to means for automaticallyindicating, and if desired, recording the particular rate of dischargefor which the mechanism is at any time adjusted and by which, ifdesired, variations in the rate of operation of the ma chine are alsoeffective in giving an indication of the rate of discharge.

A still further feature of the invention resides in means for renderingany desired unit or units inoperative by which means the rate ofdischarge may be regulated.

Further objects and advantageous con- 1925. Serial No. 44,227.

structional details will appear from a more complete description ofembodiments thereof shown in the accompanying drawings in which Figure 1is a front elevation of the mechanism showing a mechanical recorder inconnection therewith.

Figure 2 is a similar view showing an electrically operated indicator.

Figure 3 is a diagrammatic View illustrating the action of a dipper inliquids of differ ent levels.

Figure 4 is a vertical section through the mechanism along the line H ofFigure 5.

Figure 5 is a fragmentary horizontal section on line 55 of Figure 4.

Figures 6 and 7 are views similar to Figure 4, but illustrating modifiedconstructions.

Figure 8 is a detail in perspective showing a baffle mechanism forrendering any desired unit or units inoperative, the bafiie being shownin an intermediate position.

Figure 9 shows in perspective the action of the battle when in operativeposition.

Referring first to the construction illustra ted in Figures 3, 4 and 5,1 indicates a semicylindrical receptacle having a cover 2 hinged theretoat 3. Extending axially through this receptacle is a horizontal shaft 4about which are arranged in circular formation a series of clippers 5.As shown these dippers are fixed to rotate with the shaft 4 beingcarried at the outer extremities of arms 6 which are fixed at theirinner ends radially to disks 7 having hubs 8 fixed to the shaft 4, thedippers thus being arranged successively to dip up liquid from saidreceptacle and then discharge it as the shaft 4 is rotated. the opensides of the dippers facing in the direction of rotation. There may beany desired number of series of dippers each arranged in one planeperpendicular to the axis of the shaft 4 and each series containing asmany dippers as may be desired. In connection with each series ofdippers is a receiving funnel 10, which, as shown in Figure 4, mayextend over and depend on either side of the shaft 4, and for thepurpose of preventing splashing of the liquid discharged thereinto fromthe dippers, it may be provided with one or more baflies 11. From thelower portions of these tunnels may extend the outlet pipes 12 throughwhich the liquid charged into the tunnels may be passed out to asuitable receptacle or discharge trough 15.

The liquid to be measured may be supplied to the receptacle 1 as througha supply pipe 16, and an overflow pipe 17 may be provided to limit thedepth to which the liquid may rise within the receptacle.

Each of the clippers 5, according to this in vention, is so formed thatit dips up the same quantity of liquid from the receptacle even thoughthe level of the liquid therein may vary ('OHSldGI'Hbly. This isaccomplished by providing an overflow for each of the dippers sosituated that within certain limits of liquid level in the receptacle itdetermines the level of the liquid to be retained in each clipper,irrespective of the height of the dipper walls thercbeyoncl. In the formshown in Figures 3, i and 5 this overflow comprises a tube arrangedaxially within each clipper, the clippers being shown as of circularcross section, each pipe being open at its top as at 121 and located ina plane dividing the dipper into two symmetrical parts and parallel tothe shaft about which the clippers turn. The end 121 of the overflowpipe is sufficiently below the top of the dipper so that the horizontalplane representing the lowest level of the l iquid in the receptacle 1passes through the overflow and the lower edge of the open end of theswinging clipper. This act-ion of the overflow may be better understoodby reference to Figure 3, in which in the lowest dotted line position ofthe dipper the outer edge (1 is lower than the upper end 121 of theoverflow, hence this lower edge will determine the level of the liquid.in the dipper, which, when the dipper is raised to a substantiallyhorizontal position, will be below the outlet 121., hence the dipper isnot operative to pick up a maximum quantityot liquid at this low levelindicated by the dotted line zvm. As the dipper rises, however, the edgea is brought up into horizontal alinement with the outlet 12]. so at theline y-y it is on the level of the outlet 121. This level z y thenbecomes a low limit of the level of the liquid at which the amountpicked up by the dipper will be uniform. As the level of the liquid inthe receptacle is raised to the dotted line position 2*.2, it will beseen that the upper edge a of the dipper is considerably higher than theoverflow 121, but the overflow 121 then determines the level or theliquid within the dipper in the same manner that it did when the evel ofthe liquid was at the line 1, As between these positions the outlet 121is in an axis of symmetry of the dipper, the amount picked up andretained by the o' i p per is the same for any liquicllevel betweenthem, the volume between the level yg and the plane 'ZC-r-U-perpendicular to the outlet pipe 20 at the overflow 121 being exactlyequal to the empty volume between the plane ca a and the plane 3 abovethe level of the overflow 121, this relationship being maintained fromthe minimum level jI/y upwardly to above the line ee. While the clippersare shown of circular cross section, they might be of any prismoiclalcontour, being of uniform cross sectional area throughout the liquidmeasuring portions.

In place of forming the overflow by means of a. central tube projectingupwardly axially ot' the dipper, the same result may be 'proclucecl byforming one or more notches in the sides of the dipper, illustrated inthe construction shown in Figures 6 and 7 in which each of oppositesides of the dipper is shown as formed with a Vshaped notch 25, the apexof which lies in the plane of symmetry ofthe dipper parallel to theshaft about which the clippers turn.

\Vhere the overflow is formed by a pipe as at 20 arranged axailly in thedipper, its accuracy not conditioned upon its being placed. with itscentral plane arranged perpendicularly with the shaft 4: as in the casewhere the overflow is formed by side notches, as shown in Figures 6 and7. It is, however, a more diilicult construction to maintain in propercondition, particularly where liquids containing sediment or scale areencountered which would be liable to plug up the small opening throughthe overflow pipe.

In view of the fact that this mechanism is particularly intended tohandle liquids of this general nature. or liquids which are corr0 siveand can not be well handled by other types of dispensing apparatus,provision may be made for washing out the sediment or scale, or otherforeign matter, so that the amount measured by each dipper may be moreaccurately maintained at a definite value. F or this purpose provisionmay be made for cleaning out each dipper just prior to its dippingbeneath the liquid in the tank 1. As shown in Figure 4; this may be doneby with drawing liquid from the tank 1 through a pipe and projecting itby means of a centrifugal pump 31 through a pipe 32 and nozzle 33directed upwardly, so that the issuing therefrom strikes forcibly withinthe inverted dipper on its way to take up a portionof the liquid. fromthe receptacle 1. at 35 in the base of the receptacle is shown a plug bywhich the sediment and scale as it settles in the bottom of thereceptacle may be removed from time to time as may be necessary.

In Figures 6 and 7 somewhat different formsof receiving funnels for theliquid discharged from the clippers have been indi cated. In Figure 6this funnel extends below the shaft 4: on one side only, the other sidebeing inclined upwardly to form a floor $0 to receive the liquidinitially discharged from ill) per construction shown in Figure 7, the

each dipper, there being a bal'llc ll which aids in preventing splashingof the liquid from the funnel. Figure 7 the funnel is shown as aelm-cylindrical container 42 extending bcneat-h the shaft -12 and havinga floor member 43 extending between cylindrical end plans i l projectingover and partially surrounding the shaft 4, shown at i5. This tunnel construction is parti tularly suitable for the dip- (lippers beingindividually shallow and arrangcd closely together.

The amount of liquid discharged may be regulated by varying the speed ofrotation of the shaft l, but preferably in most instances, it isaccomplished by varying the number or capacity of the clippers in eachseries, and rendering as many as desired operative at one time, whilemaintaining the rotation of the shaft 4: at a substantially constantrate. course, variations in the number and capacity of the individualclippers operative and vari ation of the rate of rotation of theshaftmight be used in combination if desired.

A convenient arrangement for many pur poses and one in which variationsin quantity discharged may be varied by definite small increments may beproduced by arranging the clippers in such a manner that each series hasa capacity diilering from the adjacent series by a power of 2, that is,the successive series may have the relative capacities of l, 2, 4, 8,lo, etc. In a combination of live such series it is possible to vary theflow from 1 to 32 volumes in a given unit of time by increments 0:? onevolume with a constant speed of rotation of the shafts, this being doneby utilizing various combinations of series to give the desired totalunit flow, the other series being rendered inoperative to deliverliquid.

Various means may be provided for selectively rendering certain of theseries inoperative to discharge liquid from the receptacle. One of theseis illustrated in Figures 1, 2, 4; and 5. As therein shown each of thepipes 12- extends out through one side wall of the receptacle l, andcarries at its outer end a suitable valve, a simple form of which, asshown, comprises a union made up sufficiently t}, it with each pipe 12to prevent leakage but sufficiently loose to permit a leg 51 to belowered into the trough 15 or raised upwardly tl'ieretrom to such apoint that its outlet 52 is above the level of the liquid which beretained Within the funnels into which the clippers discharge. When anyof these legs is raised upwardly sufficiently so that its discharge endis above the level of the liquid in the corresponding funnel nodischarge therefrom can take place, the liquid in excess of thisdischarge into the funnel, flowing thereover and returning into thereceptacle 1.

Another simple form oi mechanisu'i which may be used to render anydesired series of clippers inoperative is shown in Figures 8 and 9 inwhich each of the tunnels is provided with a cover which ma be movedbodily thereover, as shown in Figure 9, so that the liquid from theclippers discharges on its upper face and is thus caused to flew backinto the receptacle, or which may be moved a orally to uncover thefunnel in order to permit th liquid to be discharged thercinto. 'lhocover or battle is shown in partly open position in Figure 8. in orderto support it the funnel may be provided with outwi rdly extendingbrackets 61 slotted for the reception o1"- guide pins 62 projectingdownwardly from the cover 60. Both or these mechani ms actuable toadjust the rate of flow from without the receptacle and while the doseris in oper ation.

It may also be desirable to furnish an indhation or even to record thecapacity of the incc ianism to dispense liquid or the rate of lischargeat any given time. A mechanical neans for so doing, which is of simplecontruccion, indicated in Figure 1. It comiiscs a series of slidescarried on a bar 71 above the receptacle 1, each of these slides havingpivoted thereon an eccentric 72. A member '73 similar to each of theslides 70 is fixed to the slide 71 at one end of the series and to thismember 7'8 is also pivoted an eccentric 72. These eccentrics haveeccentricitics proportional to the capacity of the corresponding seriesof clippers, and as shown each is connected to the leg 51 of itscontrolling valve mechanism by a rod '54 having a spring 75 interposedin its length. This rod 7% is pivoted at 76 to the corresponding disk 72at the opposite side of its center from its pivotal axis 77, so thatwhen the corresponding icg is lowered to its operative position, thedisk is pulled around so that it exteni'ls outwardly from its supportingblock and pushes against the slide '70 adjacent thereto. The amount ofmotion which it causes to this adjacent slide 70 is thus proportional toits eccentricity and is thus proportional to the capacity of the seriesof dippc s which have been rendered efi ective to discharge lh uid whenthe corresponding leg 51 has been moved to its lowered position. Inorder to provide for inaccuracies in the construction and mounting ofthe cocentric disk '72, adjustable stop screws '770 and '[80 may beprovided for limiting the eX tent of in ning moteu'ient thereof inopposite directions so that this extent is truly proportional to thecapacities of the series or clippers controlled by movement of thecorresponding leg 51. The spring 75 is interposed in order that the.disk may be turned to the same amount regardless of variations in theextent to which the leg 51 is lowered at any particular time, it beingonly necessary that this should be lowered to an amount su'l'licient tocause the series of clip pers controlled thereby to be cli cctive. As

the member 73 and the slide are arranged in series along the member 71,it is evident that a slide 7 8 against which the last disk 72 of tinseries engages is moved away from the member 73 a distance which is thesummation of the eccentricities of all the disks 72 which have beenmoved to their eccentric positions, the slide 78 being pulled toward themember 7 3 as far as is permitted by the disks 72 by means such as aweight 80 fixed to a cord 81 passing over a guide pulley 82. Mien any ofthe legs 51 is in its raised or inoperative position, the correspondingdisk 7 2 is pulled back by a sprin 84:, thus permitting all the slides 7O therelieyond to be drawn toward the member 73 by an amountproportional to the capacities of the clippers which have been renderedin0per ative. The position of the slide 78 lengthwise of the bar 71therefore furnishes a direct indication of the operative total capacityof the device to deliver liquid as adjusted at any particular time. Thisposition of the slide 78 may be transmitted to the pen 85 of a recorder86 by means of the cord 87 attached thereto so that the pen 85 mayinclicate on the recorder chart 88 the capacity of the mechanism asadjusted at any time.

In place of the mechanical recorder an electrical recorder such as shownin Figure 2 may be used. The legs 51 are each connected through a cordor wire 90 with one end of an arm 91 pivoted at 92 to a fixed member 93,the opposite end of each of the arms 91 having a weight as thereon sothat the weighted end is normally urged downwardly out of contact withan electrical contact segment 95. Whenever the leg 51 is lowered to itsoperative position, the corresponding arm 91 is swung upwardly intocontact with its segmentso as to establish electrical connection throughthe arm 91, the segment, and a resistance such as R1, R2, R3 and B l,between a generator 97 and an ammeter 96 in series with the segment 95,these resistances being arranged in parallel. The resistances R1, R2,R3, R 1, etc. are reciprocally proportional to the capacities of thecorresponding series of clippers so that the ammeter reading isproportional to the number of series of clippers which are in activecondition at any time, the generator voltage being constant. If thegenerator 97 is carried by the shaft t shown in Figure 2 any variationin speed of the shaft will also be effective to vary the voltage of thegenerator which will thus modify the ammeter reading so that the ammeterreading discloses the rate of discharge of the device which is due notonly to the number of clippers effective at any one time, but also totheir frequency of discharge, this being proportional to the speed ofrotation of the shaft 4. If the ammeter 96 is of the recording type, arecord will be made of the discharge of liquid continuously. This mechanism also has the advantage that it indicates or records the actualrate of discharge rather than merely its adjustment for discharge rateif actuated at a predetermined constant speed, as in the case of themechanical recorcler.

Of course either of the recorders shown may be used in connection withany type of control mechanism for rendering any series of clippersineffective to discharge liquid. The battle construction shown in Figure8 is illustrated in connection with the electrical recording mechanismshown more particularly in Figure 2. Itwill be seen that the arm 91corresponding to the particular series of clippers is connected by meansof a cord 98 passing about suitable guide pulleys to an arm 99 extendingfrom a portion of the baffle or cover 60, so as this cover is moved tocover the funnel the arm 91 is allowed to drop off from the segment 95,and as the cover moved to uncover the funnel and permit the dipper-s tobe effective in measuring out liquid the arm 91 is drawn up into contactwith its segment.

The term liquid as used in this application is intended to include anymaterial sufficiently fluent to be handled by a device of the closertype.

Having thus described certain embodiments of this invention, it will beevident to those skilled in the art that various changes andmodifications might be made therein without departing from its spirit orscope, as defined by the appended claims.

I claim:

1. A mechanism of the class described comprising a receptacle forcontaining a liquid, a shaft extending horizontally over the surface ofthe liquid in said receptacle, clippers arranged in circular seriesabout said shaft in a manner successively to dip up liquid from saidreceptacle and discharge such liquid as said shaft is rotated, a troughinto which the liquid is discharged, means for supplying liquid to saidreceptacle and means for cleaning the interior of eac dipper before eachfilling movement thereof.

2. A mechanism of the class described comprising a receptacle forcontaining a liquid, a shaft extending horizontally over the surface ofthe liquid in said receptacle, clippers arranged in circular seriesabout said shaft in a manner successively to dip up li uid from saidreceptacle and discharge suc liquid as said shaft is rotated, a troughinto which the liquid is discharged, means for supplying liquid to saidreceptacle,and means for projecting liquid from said receptacle intoeach dipper while it is in inverted position prior to clipping liquidfrom said receptacle.

3. In a mechanism of the class described, a receptacle for containing aliquid, a horizontal shaft extending across said receptacle above thelevel of liquid therein, a plurality of series of dippers, each seriesbeing arranged in circular formation about said shaft and in positionfor the clippers of each series to dip successively beneath the liquidin said receptacle and then discharge the liquid so clipped up, a funnelfor receiving the liquid discharged from the clippers of each series,means for receiving liquid from the several i'unnc and means forselectively rendering inopei ive to deliver liquid to said receivingmeans the dippers of each series.

4:. In a mechanism of the class described a receptacle for containing aliquid, a horizontal shaft extending across said receptacle above thelevel of liquid therein, a plurality of series of dippers, each seriesbeing arranged in circular imrmation about said shaft and in positionfor the clippers of each series to dip successively beneath the liquidin said receptacle and then discharge the liquid so dipped up, a tunnelfor receiving the l1qu1d discharged from the clippers of each series,means for receiving liquid from the several tunnels, and means forcovering any one or more oi said funnels to preventliquids dischargingfrom the corresponding dippers from passing to said receivin means.

In a mechanism of the class described, a receptacle for containing aliquid, a shaft extending horizontally across said receptacle, dippersarranged in a plurality of circular series about said shaft in a mannerto dip up and discharge liquid from said receptacle aid shaft isrotated, tunnels for receiving the liquid discharged from the clippersoi each series, a trough for recelving the liquid from each of saidfunnels, means for renderany of said funnels inoperative at Wlll fordelivering liquid to said trough, and means responsive to the conditionsoi said inoperative rendering means for 1nd1cat1ng the total capacity ofsaid mechanism at any instant.

(S. In a mechanism of the class described, a receptacle for containingliquid, clippers, means for causing each dipper to alternately dip upliquid from said receptacle and to then dischar e said liquid, means forreceivinc; the discharge from said dippers, and means actuable fromwithout said receptacle for rendering various numbers of said dippersinoperative to deliver liquid to said receivin;- means whereby toregulatethe rate of discharge of said liquid from sald mechanism.

7. In a mechanism of the class described, a receptacle for containingliquid, clippers, means for causing each dipper alternately to dip upliquid from said receptacle and to then disch said liquid, means forreceiving the discharge from said clippers, and means actuable while themechanism is in operation for rendering various numbers of said clippersinoperative to deliver liquid to said receiving means whereby toregulate the rate of discharge of said liquid from said mechanism.

8. In a mechanism of the class described, a receptacle for containingliquid, dippers arranged in a plurality of series, means for causingeach dipper alternately to dip up liquid from said receptacle and tothen discharge saicl liquid, means for receiving the discharge from saiddippers, and means actuable to simultaneously render all the dippers ofany one series inoperative to deliver liquid to said receiving means.

9. In a mechanism of the class described, a receptacle for containingliquid, dippers arranged in a plurality of series, means for causingeach dipper to alternately clip up liquid from said receptacle and tothen discharge said liquid, means for receiving the discharge from saiddippers, means for rendering various numbers of said dippers inoperativeto deliver liquid to said receiving means whereby to regulate the rateof discharge of said liquid from said mechanism, and means responsive tosaid inoperative rendering means for indicating the rate of discharge.

10. In a mechanism of the class described, a receptacle for containingliquid, dippers arranged in a plurality of series, means for causingeach dipper to alternately dip up liquid from said receptacle and tothen discharge said liquid, means for receiving the discharge from saiddippers, a member associated with each of the groups of said dippers andmovable between a position in which the dippers of its group areeffective to discharge liquid into said receiving means and a positionin which the dippers of its group are ineffective to discharge liquidinto said receiv ing means, an indicator, and means responsive to thepositions of said members for controlling said indicator.

11. In a mechanism of-the class described, a receptacle for containingliquid, groups of dippers, the dippers of each group being arranged tosuccessively dip beneath the liquid in said receptacle to remove aquantity therefrom, and then to discharge said quantity, means forreceiving the liquid so discharged. a rotary shaft for actuating saiddippers, a member associated with each group of dippers and movablebetween a position Where the dippers of its group are effective todischarge into said receiving means and a position where the dippers ofits group are ineffective to discharge into said receiving means, agenerator driven from said shaft, an ammeter, and a resistanceproportional to the reciprocal of the capacities of the dippers of eachgroup closing the circuit between said generator and ammeter only whenthe movable member associated with the corresponding group is in suchposition that the dippers of that group are effective to discharge intosaid receiving means.

12. In a mechanism of the class described, a receptacle for containingliquid, groups of clippers arranged to remove liquid from saidreceptacle and to discharge such liquid, means for receiving the liquidso discharged, means for rendering the dippers of any group ineffectiveto discharge into said receiving means, and means responsive both to thecapacity of all the clippers effective to discharge into said receivingmeans and their frequency of discharge for indicating the rate ofdischarge to said receiving means.

13. In a mechanism of the class described, a receptacle for containingliquid, clippers, means for causing each dipper alternately to dip upliquid from said receptacle and to then discharge said liquid, means forreceiving the discharge from said dipper-s, and means for varying thecapacity of said mechanism to deliver liquid by definite increments,said means being actuable While said mechanism is in operation, saidmechanism including means operative While said mechanism is in operationfor actuating said varying means.

14. In a mechanism of the class described, a. receptacle for containingliquid, clippers, means for causing each clipper alternately to dip upliquid from said receptacle and to then discharge said liquid, means forreceiving the discharge from said clippers, and means actuable While themechanism is in operation for rendering various numbers of said clippersinoperative to deliver liquid to said receiving means whereby toregulate the rate of discharge of said liquid from said mechanism, eachof said clippers being formed to dip up the same quantity of liquidregardless of substantial changes of level in said receptacle.

15. In a mechanism of the class described, a receptacle for containingliquid, groups of clippers arranged to remove liquid from said.receptacle and to discharge such liquid, means for receiving the liquidso discharged, means for rendering the clippers of any group ineffectiveto discharge into said receiving means, and means responsive both to thecapacity of all the clippers effective to discharge into said receivingmeans and their frequency of discharge for indicating the rate ofdischarge to said receiving means, each of said clippers being formed todip up the same quantity of liquid regardless of substantial changes oflevel in said receptacle.

16. In a mechanism of the class described, a

. plurality of discharge means having capacities each differing fromthat of each of the others by a power of tWo, and means for selectivelyrendering any one or more of said means ineffective to discharge fromsaid mechanism.

17 In a mechanism of the class described, a receptacle for containingliquid, clippers arranged in a plurality of series, means for causingeach dipper alternately to dip up liquid from said receptacle and thento dis charge said liquid, the clippers of each series having a combinecapacity differing from the total capacity of the dippers of each otherseries by a power of two, and means for causing all of the buckets ofany selected of said series to be inoperative to discharge from saidmechanism.

In testimony whereof I have affixed my signature.

MILTON O. SCHUR.

